Wednesday, November 21, 2007

What the hell is JVM , Session , Cache ?

From quite some days, I find threads on OAF Forums, where people could not understand the basic terminology of J2EE like session,JVM , Oracle user session, cache etc. I think these terms are not new for people from Java background, but for people who come from pl/sql background or not from Java background, these terms might look like hammers.I remember one thread where I and Tapash were replying somebody asked whats' the difference between ICX session and http session, I wanted to reply, but I thought, replying there would make thread too long, i guess that thread already crossed 4 pages and replying there may not reach to all target audience.
So, I decided to write a small article for the same..... and in fact I must say my article is nothing but compilation of information from OAF Developer's guide , googling , metalink, blogs and lastly my knowledge....[You must be doubting on the last point.... even i am :)]

So, lets start with basic terminalogy:

About JVM
At the heart of the Java platform lies the Java Virtual Machine, or JVM. Most programming languages compile source code directly into machine code, suitable for execution on a particular microprocessor architecture. The difference with Java is that it uses bytecode - a special type of machine code.
Java bytecode executes on a special type of microprocessor. Strangely enough, there wasn't a hardware implementation of this microprocessor available when Java was first released. Instead, the processor architecture is emulated by what is known as a "virtual machine". This virtual machine is an emulation of a real Java processor - a machine within a machine (Figure One). The only difference is that the virtual machine isn't running on a CPU - it is being emulated on the CPU of the host machine.



The Java Virtual Machine is responsible for interpreting Java bytecode, and translating this into actions or operating system calls. For example, a request to establish a socket connection to a remote machine will involve an operating system call. Different operating systems handle sockets in different ways - but the programmer doesn't need to worry about such details. It is the responsibility of the JVM to handle these translations, so that the operating system and CPU architecture on which Java software is running is completely irrelevant to the developer.



The Java Virtual Machine forms part of a large system, the Java Runtime Environment (JRE). Each operating system and CPU architecture requires a different JRE. The JRE comprises a set of base classes, which are an implementation of the base Java API, as well as a JVM. The portability of Java comes from implementations on a variety of CPUs and architectures. Without an available JRE for a given environment, it is impossible to run Java software.
Differences between JVM implementations
Though implementations of Java Virtual Machines are designed to be compatible, no two JVMs are exactly alike. For example, garbage collection algorithms vary between one JVM and another, so it becomes impossible to know exactly when memory will be reclaimed. The thread scheduling algorithms are different between one JVM and another (based in part on the underlying operating system), so that it is impossible to accurately predict when one thread will be executed over another.
Initially, this is a cause for concern from programmers new to the Java language. However, it actually has very little practical bearing on Java development. Such predictions are often dangerous to make, as thread scheduling and memory usage will vary between different hardware environments anyway. The power of Java comes from not being specific about the operating system and CPU architecture - to do so reduces the portability of software.

Summary

The Java Virtual Machine provides a platform-independent way of executing code, by abstracting the differences between operating systems and CPU architectures. Java Runtime Environments are available for a wide variety of hardware and software combinations, making Java a very portable language. Programmers can concentrate on writing software, without having to be concerned with how or where it will run. The idea of virtual machines is nothing new, but Java is the most widely used virtual machine used today. Thanks to the JVM, the dream of Write Once-Run Anywhere (WORA) software has become a reality.

JVM Cache and Its impelemetation in Oracle Apps:

Qestions like what is cache? How is it related to JVM? How is caching implementated in Oracle Apps?Instead of me explaining this, it would be best if you go through the brilliant explanation by Mike Shaw on Steven Chan’s blog.Here is the link:
Mike Shaw's article about JVM Cache


HTTP SESSION

HttpSession is nothing but a java interface.The servlet container uses this interface to create a session between an HTTP client and an HTTP server.
The session persists for a specified time period, across more than one connection or page request from the user. A session usually corresponds to one user,
who may visit a site many times. The server can maintain a session in many ways such as using cookies or rewriting URLs.
This interface allows servlets to View and manipulate information about a session, such as the session identifier, creation time, and last accessed time
Bind objects to sessions, allowing user information to persist across multiple user connections.

ICX Session or Oracle Applications User Session
(Is it same as HTTP session/servelet session ?)


A http session or a servelet session usually corresponds to an application login/logout cycle, but that is not strictly true in the case of OA Framework applications.I tell u y ? When the user logs in to an OA Framework application, the OA Framework creates an AOL/J oracle.apps.fnd.common.WebAppsContext object and a browser session-based cookie that together keep track of key Oracle Applications context information like the current responsibility, organization id and various user attributes such as user name, user id,
employee id and so on.
The cookie contains an encrypted key identifier for a session row stored in the Applications database.Specifically, this is the servlet session ID which, in its decrypted form, serves as the primary key in the
ICX_SESSIONS table.(to get an idea do run Select * from ICX_SESSIONS , to get an exact idea of what information is stored in the table)
The WebAppsContext retrieves this key value after each request and uses it to query the current session state.
The Oracle Applications user session or ICX SESSION is associated and not dependent with a servlet session, because , it has its own life cycle and time-out characteristics. Generally, the Oracle Applications user session has a longer life span than the servlet session. The servlet session should time-out sooner.

User session is dependent on following profiles:

a)ICX: Limit Time :Determines the maximum Oracle Applications user session length( in
hours.

b)ICX:Session Timeout: Maximum idle time for the Oracle Applications user session
(specified in minutes).

While servelet session timeout is purely dependent on setting in Apache Jserv session timeout setting.

An Oracle Applications user session might be associated with multiple http servlet sessions. For example, the servlet session times out
while the user takes a phone call in the middle of creating an OA Framework expense report, then resumes work before the Oracle Applications user session
times out.If the Oracle Applications user session times out, aslong as the user does not close the browser window (so the browser session-based cookie isn't
lost) and no one deletes the corresponding session row in the ICX_SESSIONS table, the user can resume her transaction at the point where he stopped working
after being prompted to log back in.
Although the best practice as per Oracle standards is to sync ICX_SESSION and servelet session,till passivation feature is implenented in Oracle Apps. Passivation is still not supported in 11i and 12i.


This is straight from metalink “The ICX: Session Timeout option sets the the maximum number of minutes to wait before invalidating an idle ICX Session. The default value is null. The web server session timeout value, or more appropriately the Apache Jserv Session value is used to specify the number of milliseconds to wait before invalidating an unused session. The default value is 1800000 or 30 minutes.
We recommend that you set the ICX: Session Timeout and the Apache Jserv Session to be the same. It's better to be consistent and let the ICX session and the Apache Jserv (middle tier) session expire at the same time. If the ICX session expires before the Jserv session, the user will be presented with a login page even though the Jserv session is still active. If the user logs back in before the Jserv session expires, they will see the old state of their middle-tier transaction. This can be confusing, since from the point of view of the user there is no distinction between the ICX session and the Jserv session.
We also recommend that you do not set the Apache Jserv Session timeout to be any higher than 30 minutes. Longer idle sessions will drain the JVM resources and can also cause out of memory errors.
The session timeout for the webserver is specified via the following directive in the /Jserv/etc/zone.properties file.
session. timeout=1800000”


I think by now you must be crystal in ur understanding of basic key terms in J2EE.I would like to stress on one thing... JVM cache is shared across servelet/http sessions , and is purely dependent on first login, it can be removed progrmatically by invalidating the cache or by bouncing the apache server.

Any doubts or queries are welcome!

14 comments:

anurag vidyarthi said...

Hi Mukul,

I am new in Apps but got good idea about the basic Apps context and Apps session .

Good work bro...

BR
Anurag

Mukul said...

Thanks for the comments Anurag...!
--Mukul

Sudhakumar said...

Hi Mukual,
Today I saw your post. Very informative. I have a doubt - If I put a static variable in a class and deploy in OAF, will it be static (persist its value) only for a session or across all sessions?

Regards,
Kumar

Mohamed said...

Hi Mukul,

I am executing one query through VO. as it takes long time, the page displays "Page cannot be displayed" but the background session is active and I am unable to cancel the execution of the VO too. In this situation,I am unable to login back if I close the window. Could you please give me a solution for this?

Thanks,
Raja

Mohamed said...

Hi Mukul,

I am executing a query through VO. Since the query is running long, the page is getting expired and shows "Page cannot display".
But, the backend session is active. Also, I am unable to login back to apps until that session completed. Could you help me in this?

Thanks,
Raja,

subbu said...

Good Article ..
I have one question.

How to invalidate ICXsession.

Nilesh said...

Hi Mukul,

We have custom OAF application in which when user opens two sessions of the same application on one PC and when user save(commit) the changes in one session, OAF saves the data from both the sessions in to one table. This occurs in MS Internet Explorer but does not occur in Mozilla Firefox. How we can prevent this in MS IE? Thanks and regards.
Nilesh

Ash Manukyan said...

Hi Mukul. Im new java.
I developed an java desktop application and this app connects to oracle db with apps and queries data from a view. the problem is that in PRODUCTION I got no apps password. I was wondering if you have some article about creating a apps session from a desktop application.
I'm in a big trouble.

Many thanks..
Great Blog!!

Mukul said...

Ash,
Refer to blog entry of steven chan:

http://blogs.oracle.com/stevenChan/2010/01/appsdatasource

(Due to formatting issues the above url does not show the full URL, just append "_jaas_ebs.html" at the end.)

which basically tells about the patch u can install, which will allows ou to configure a AppsDataSource which enables access to the Oracle E-Business Suite APPS database schema from external Java EE environments without sharing the APPS schema password.

--Mukul

sridhar said...

Mukul
i could not find the following location
/Jserv/etc/zone.properties

for the sessoin timeout of servlet..

Sridhar

Anna said...

Great and Useful Article.

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shivinder kaur said...

Hi Mukul,

Is it possible that we can disable these cookies and manage all information in session?

Regards,
Shivinder

shivinder kaur said...

Hi Mukul,

Is it possible that we can disable these cookies and manage all information in session?

Regards,
Shivinder

Naviya Nair said...

I have read your blog its very attractive and impressive. I like it your blog.

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